Understanding Map Projections

DOUBLE STEREOGRAPHIC
Oblique aspect—The central meridian and parallel of
latitude with the opposite sign of the central latitude.
PROPERTIES
Shape
Conformal. Local shapes are accurate.
Area
True scale at center with distortion increasing as you
move away from the center.
Direction
Directions are accurate from the center. Local angles
are accurate everywhere.
The Rijksdriehoekstelsel coordinate system is used in the
Netherlands. The central meridian is 5°23'15.5" E. The latitude
of origin is 52°09'22.178" N. The scale factor is 0.9999079. The
false easting is 155,000 meters, and the false northing is
463,000 meters.
DESCRIPTION
A conformal projection.
PROJECTION METHOD
Planar perspective projection, viewed from the point
on the globe opposite the point of tangency. Points
are transformed from the spheroid to a Gaussian
sphere before being projected to the plane.
Distance
Scale increases with distance from the center.
LIMITATIONS
Normally limited to one hemisphere. Portions of the
outer hemisphere may be shown, but with rapidly
increasing distortion.
USES AND APPLICATIONS
Used for large-scale coordinate systems in New
Brunswick and the Netherlands.
All meridians and parallels are shown as circular arcs
or straight lines. Graticular intersections are
90 degrees. In the equatorial aspect, the parallels
curve in opposite directions on either side of the
equator. In the oblique case, only the parallel with
the opposite sign to the central latitude is a straight
line; other parallels are concave toward the poles on
either side of the straight parallel.
POINT OF CONTACT
A single point anywhere on the globe.
LINEAR GRATICULES
Polar aspect—All meridians.
Equatorial aspect—The central meridian and the
equator.
46 • Understanding Map Projections